Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!UMDD.BITNET!BBOURBIN
From: BBOURBIN@UMDD.BITNET (Brett S Bourbin)
Newsgroups: comp.sys.amiga
Subject: Reading the gameport.device
Message-ID: <8806151701.AA08881@jade.berkeley.edu>
Date: 15 Jun 88 13:11:07 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 36


I want to use the first port on the Amiga to send mouse movements to my
program, so I configured it and now I am ready to read the events.

Can I do a:
            move.b    #GPD_READEVENT,IO_COMMAND(a2) ; read cmd in io block
            move.l    eventbufbase,a3               ; get the buffer address
            move.l    a3,IO_DATA(a2)                ; tell where to store evnt
            move      #ie_SIZEOF,IO_LENGTH(a2)      ; set the size
and then do a:
            move.l    a2,a1                         ; pass io block
            callsys   SendIO                        ; ASYNC io send

Now I have asked for a event to be reported, according to my triggers set,
(more on those later).

The program I am using this for is a loop which reads the mouse port, if there
is a message, processes the mouse movement or triggers, and then updates the
grapgics according to results.  So I want to be able to READ the gameport each
time through the loop.  Now, here comes the real question {AT LAST! 8^) }:

   Can I use the GetMsg() call, since it will return a zero if there is no
   messages waiting, and if I get a result on the first call to the routine,
   do more until I get a zero?  I want to do this because I only need the
   latest event.  Is this the best way of doing what I want, or should I do
   a CheckIO() call and if I get a non-zero return then do a GetMsg()?

Now about the triggers- I set the mouse to report movements >= 2 in any
direction, also for all up and down mouse buttons.  Can I set the timeout
value in the trigger structure to some value so it will never timeout?  I
do not need it, and I don't just want to set it to some large value and have
it still timeout if let alone for a long time.

Thanks for any help you may lend.

Brett S Bourbin         Internet: brett@PIGPEN.UMD.EDU
Instructional Computing Programs -- University of Maryland, College Park